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Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
2003 Equity Incentive Plan [Member]
      
Stock-Based Compensation and Common Stock (Textual) [Abstract]      
Shares available for issuance 31.0    
Common stock reserved for issuance 81.1    
Description of share based payment award

Under the 2003 Plan, the Company may grant stock options and stock appreciation rights with an exercise price that is no less than the fair market value of the stock on the date of grant. Under the 2003 Plan, the Company may also grant restricted stock and restricted stock unit awards to employees and non-employee directors. The Company typically grants restricted stock units. No participant may be granted stock options covering more than four million shares of stock or more than an aggregate of one million shares of restricted stock and restricted stock units in any fiscal year. The term of each option or restricted stock unit is determined by the Board of Directors or its delegate and, for option grants on or after February 12, 2004, is generally seven years. Options generally vest in annual increments of 25% per year commencing one year from the date of grant.

In May 2010, the 2003 plan was amended to increase the shares available for issuance under the plan to a total of 45 million shares, with 30 million shares for restricted stock and restricted stock units, and to update the performance measures that can be used to determine the vesting of awards intended to qualify for deductibility under Section 162(m) of the Internal Revenue Code to better match the metrics the Company uses to manage its business.

    
Employee Stock Option [Member]
      
Stock-Based Compensation and Common Stock (Textual) [Abstract]      
Total unrecognized compensation expense related to unvested stock options, net of estimated forfeitures $ 28.2    
Total intrinsic value of options exercised 22.9 4.2 0.6
Cash received from stock option exercises 53.9    
Period to recognize total unrecognized compensation expense related to unvested stock options, net of estimated forfeitures on a weighted-average basis 2.0    
Employee Stock Purchase Plan [Member]
      
Stock-Based Compensation and Common Stock (Textual) [Abstract]      
Shares available for issuance 20.8    
Shares of common stock sold under the ESPP 5.8 6.7 5.1
Cash received from employee stock purchase plan issuances 27.1    
Average price per share of common stock sold under the ESPP $ 4.64 $ 4.72 $ 2.67
Description of share based payment award

Under the ESPP, rights are granted to LSI employees to purchase shares of common stock at 85% of the lesser of the fair market value of such shares at the beginning of a 12-month offering period or the end of each six-month purchase period within such an offering period.

In May 2010, the ESPP was amended to increase the shares available for issuance under the plan to a total of 30 million shares and to extend the term of the ESPP through May 12, 2020. In March 2009, the ESPP was amended to increase the maximum number of shares that a participant can purchase in a single purchase period from 1,000 shares to 2,000 shares, effective November 15, 2009.

   
Performance-based Restricted Stock Units [Member]
      
Stock-Based Compensation and Common Stock (Textual) [Abstract]      
Total unrecognized compensation expense related to performance based awards, net of estimated forfeitures 22.2    
Weighted-average grant date fair value 26.1 16.8  
Total fair value of shares vested 6.3    
Recognition period for unrecognized compensation expense related to the performance-based RSU's, net of estimated forfeitures 3    
Service-based Restricted Stock Units [Member]
      
Stock-Based Compensation and Common Stock (Textual) [Abstract]      
Total unrecognized compensation expense related to unvested stock options, net of estimated forfeitures 52.7    
Weighted-average grant date fair value 55.7 40.8 1.7
Total fair value of shares vested $ 14.6 $ 8.9 $ 15.2
Period to recognize total unrecognized compensation expense related to unvested stock options, net of estimated forfeitures on a weighted-average basis 2.9